Bobbin and method of making same



Sept; 20, 1949.

R. G. TURNER BOBBIN AND METHOD OF MAKING SAME Filed Nov. 26, 1948 R E NR W vr.. m. N N G R JV/ n E D, TOI V R 5 B m m AV. u w. M m a B y F en lb M G w. H. f u 2 2 F l? n w N 6 s 2... F 2 .I W- WI H .2 ll. d D m 4 m.l m 2 O l l m 2 rr.

Patented Sept. 2Q, 1949 UNITE STAT ES PAT O FF Y 482,440 Y EBBINDMTHODoF MAKING SAME ilmrli iurngr, Woresferl Mass assignerI to CromptonenowlesLoom'works, Worcester, Mass., :incorporation of MassachusettsApplication Nveibr 26, 1948, Serial No; 625203 t (cl. 'les- 296) Thisinvention relates to improvementsin bobbins to beused with electricYweft detecting systems in looms'and tothe method of their manufacture;and itis-the general object o the invention to provide a bobbin with aferrule of generallyconicalform flttinggsteps on; the bobbin in suchmanner asto'hold the ferrule rmly to the bololoin.

In the past ithas beenv customary to provide bobbins fonel'ectric weftdetectorsvstems with cylindrical ferrules for engagement 'with'.the twofeeler nngers or electrodesbf the, weft detector. These ferrules. havegenerally been cylindrical with a diameter aboutrthe same as that of thebobbin on v vllicn-the- Weft is YWound.'` When the weft on'suha bobbinis 'almost exhausted it wraps around the bobbin barrel severaltlmes anddoes notunwind freely. [Breakageyofithe weft frequently results dueprimarilyto the fact that the ferrule is cylindrical. Y

It isan important object of this' inventiolrt'o provide a bobbin; withaconical metallic ferrule ladjacentto the'bobbin butt and r'mly'securedthereto. in such manner Athat' itwill not slip off thebobbirl.. Inorderthat the ferrule; which cori'- stitutes the detecting zone of thebobbinjm'aybe held tightly'to the bobbin.itisprovided with a series ofsteps which may llavea taper opposite tothe generalltaper 'of thedeteotingrzone'. More generally at least one of tnestepsle triade-se'that a part 'of it 'at a` given distance -fro'in'the butt has adiarnterless than the-'diameter of another part thereof niore distant from theYbuttT` The vaforesaid stp's therefore neednot necessarily be conical;Vsince the relation of th diameters-offline l isv a `plan vieyv showingthe Y.improved y botblliwitli its ferrule in etlitaetxwithatype ofelectric weft d'etcztl'ilY which is in common'us' on `certain types ofweft replenishing looms,

Fig. 2 is an enlarged transverse section of the bobbin on line 2--2,Fig. 1,

Fig. 3 shows the bobbin after the rststep in the formation oftheierrulehas been performed, Fig.1 4 is an enlarged transverse section online 4-4,Flg.3, Fig. 5 is a longitudinal section throughthe bobbin afterthe second step Ain the formation oftheferrule has been performed andFig. 6 is anvenlarged diagrammatic vieu( shov'ving the relationbetweenthebodyoi the bobbin, the enamel coating, the electric conductingpaint, and the metal ferrule.

Referring particularly to Fig. 1, the v'veftdetector designated at D hasright and left detector lingers I IJ andll whicnmay be oonneotedbywiresI2 and I3 to a loom controlling c zirouit.I The detector comprisesabaseor bo dy.| 6 lnade of insulatingmaterial andinvvhich thengers IUand I I are slidablebackwardly and forwardly A detector may be-securedta support I4 by means of bolts I5.

rhepobblri setrerth herein will 'have 'seme characteristcs common tobobbins alreadyA in s uchfor instancq as a butt t0 provided tvith'thcusualrings 2| by Whiohthebobbinis held inthe .Y shuttle of a tv eftreplenishinglooinan'd abarrl 22 en whiol'l eft is Wound; The barrel/22may temllnetewltn the usual tlp 23. 'rnebetly 2'4of the bobbin may bemade of acheap but absorbent material, such Aas vvoodor paper. Atperiodic intervals during loom operation the bobbin is presented tothedetector D, andlsolon'gias suincient weft vfor continued Weavingispresent on the bobblrjl the engere lo andv ll wlllbe kept insulated fromeeen other, but when the weft le depleted the fingers 'of the detectorare elec'- trically connected by apart of the bobbin to be described toclose a loom controlling electric circut.

The matter thus far described, except for that part 'of the bbblnwlllellelectrically connects the detector lingers ID and Il, may be the same asthat heretofore used.

ne wenn 'feinte the, Sblt eater., 'ofthe present invention may have ayiiart of its vbofdy 24 between the butt 2li and the barrel 22 formedwith a general taper which diminishesin a direction fromthe butt toward'the tip. This general taper is indicated at Z5-in Fig. 5 andcorresponds to thedetecting zone 26 of the bobbin. The tapered part 25is provided with a plurality of steps 2l which as shown Fig. 5 aretapered toward the butt. There may be as many steps as are required Ytoprovide the detecting Zone o'f the Kloobbin.

The bobbin is then dipped in an enamel and baked to provide an inclosingcoating which prevents entry of Water or steam into the wood of thebobbin. This coating is indicated at 28 and preferably though notnecessarily Waterproofs the entire bobbin. The tapered part 25 is thencovered with a layer of electric conducting paint 29 containing nelydivided metallic particles, such as silver. This paint is applied to theeX- terior of the taper 25 and 4covers that part of the bobbincorresponding to the detecting zone.

The bobbin is then placed in an electrolytic bath and connected to oneof the electrodes thereof so that a metallic ferrule F may be depositeddirectly on and be bonded to the coat of paint. During deposition of theferrule the enamel coating 28 prevents the wood of the bobbin fromabsorbing the acid of the electrolytic bath. The paint conforms to theshape of the steps as will also the metal shell or ferrule, and it isfor this reason that the ferrule will be held firmly to the bobbin andwill not be able to slide thereon in a direction from the butt towardthe tip. I have found that a slight amount of taper on the steps will besufficient to hold the ferrule very rmly to the bobbin.

The steps will be separated from each other by radial shoulders 3U, seeFig. 6, which will also be covered with the paint and deposited metal sothat the ferrule will be a single piece of metal and be able to close acircuit through the detector fingers Ill and Il wherever the latterengage it.

While the steps have been described as tapered toward the bobbin buttthe invention is not necessarily limited to steps of this form. It willbe suicient if the steps are of such form that one diameter thereof isless than another diameter thereof more distant than the one diameterfrom the bobbin butt. Thus, in Fig. 5 the diameter a of one of the stepsis less than diameter b of the same step but farther from the butt 2Bthan is diameter a.

From the foregoing it will be seen that the invention sets forth abobbin having a weft detecting zone which tapers generally in adirection from the butt toward the tip thereof, thereby insuring betterunwinding of the weft than is the case with cylindrical ferrules. Thedetecting zone is made up of a series of steps which may be tapered in adirection opposite to the general taper of the zone. Because of thereverse tapers ofthe steps the ferrule is very securely attached to thebobbin. It will also be seen that the invention sets forth a method ofmaking a bobbin with a metallic ferrule including the steps of providinga non-conducting base, such as wood, with steps, waterproofing thebobbin, coating the steps with a layer of electric conducting paint orthe like, and thereafter bonding a metallic ferrule to the layer ofpaint by electrolytic action.

Having thus described the invention it will be seen that changes andmodifications of the foregoing speciflc disclosures may be made Withoutdeparting from the spirit and scope of the invention.

What is claimed as new is:

1. In a bobbin for use with the electric weft detecting system of aloom, a bobbin body having a detecting Zone tapering generally from thebutt toward the tip of the bobbin, steps on said zone, a waterproofingcoating on the bobbin, a layer of electric conducting paint on thecoating on the 4 detecting zone, and a metallic ferrule bonded to thelayer of paint.

2. In a bobbin for use with the electri-c weft detecting system of aloom, a bobbin body having a detecting zone tapering generally from thebutt toward the tip of the bobbin, steps on said zone, at least one ofsaid steps being of such form that one diameter thereof is less thananother diameter thereof more distant thanr said one diameter from thebobbin butt, a Waterproofing coating on said zone, a layer of electriccurrent conducting paint on the coating on said Zone, and a metallicferrule bonded to said layer of paint.

3. In a bobbin for use with the electric weft detecting system of aloom, a bobbin body having a detecting zone tapering generally from thebutt toward the tip of the bobbin, steps on said Zone tapered toward thebobbin butt, a coating of enamel on said zone, a layer of electricconducting paint on the enamel on said zone, and a metallic ferrulebonded to said layer of paint.

4. The method of making a bobbin for use with the electric detectingsystem of a loom, the method consisting in the following steps: forminga bobbin body with a detecting zone tapering generally from the butttoward the tip of the bob-bin and forming steps on the detecting zone,providing the bobbin with a waterproofing coating, placing a layer ofelectric conducting paint on the coating on the detecting zone, andelectrolytically depositing a metal ferrule on the layer of paint.

5. The method of making a bobbin for use with the electric detectingsystem of a loom, the method consisting in the following steps: forminga bobbin body with a detecting zone tapering generally from the butttoward the tip of the bobbin and forming steps on the detecting zone, atleast one of said steps being of such form that one diameter thereof isless than another diameter thereof more distant than said one diameterfrom the butt, providing the detecting zone with a coating ofwaterproofing material, placing a layer of uid electric conductingmaterial on the coating on the detecting zone, and electrolyticallydepositing a metallic ferrule on said layer of conducting material.

6. The method of making a bobbin for use with the electric detectingsystem of a loom, the method consisting in the following steps: forminga bobbin body with a detecting zone tapering generally from the butttoward the tip of the bobbin and forming stepson the detecting zonewhich taper toward the butt, providing the bobbin with a waterproofingcoating, placing a layer of electric conducting paint on the coating onthe detecting zone, and electrolytically depositing a metal ferrule onthe layer of paint.

RICHARD G. TURNER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 335,783 Stone Feb. 9, v1886FOREIGN PATENTS Number Country Date 364,195 Great Britain Jan. 7, 1932631,658 France Sept. 17, 1927

